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Share Based Compensation - Summary of Compensation Expense (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Total compensation expense | kr 4,257 |
Executive performance plan [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 107 |
Executive performance plan [member] | EPP 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 62 |
Executive performance plan [member] | EPP 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 45 |
Key contributor plan [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 3,909 |
Key contributor plan [member] | Key contributor plan 2024 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 1,127 |
Key contributor plan [member] | Key contributor plan 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 1,431 |
Key contributor plan [member] | Key contributor plan 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 827 |
Key contributor plan [member] | Key Contributor Plan2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 524 |
Cash-settled plans [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 4,016 |
Reporting year [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Total compensation expense | 2,073 | kr 1,371
Reporting year [member] | Executive performance plan [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 27 |
Reporting year [member] | Executive performance plan [member] | EPP 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 30 |
Reporting year [member] | Executive performance plan [member] | EPP 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | (3) |
Reporting year [member] | Key contributor plan [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 1,953 |
Reporting year [member] | Key contributor plan [member] | Key contributor plan 2024 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 1,127 |
Reporting year [member] | Key contributor plan [member] | Key contributor plan 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 620 |
Reporting year [member] | Key contributor plan [member] | Key contributor plan 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 217 |
Reporting year [member] | Key contributor plan [member] | Key Contributor Plan2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | (11) |
Reporting year [member] | Cash-settled plans [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 1,980 |
2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Total compensation expense | 1,344 |
2023 [member] | Executive performance plan [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 36 |
2023 [member] | Executive performance plan [member] | EPP 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 20 |
2023 [member] | Executive performance plan [member] | EPP 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 16 |
2023 [member] | Key contributor plan [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 1,232 |
2023 [member] | Key contributor plan [member] | Key contributor plan 2024 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 0 |
2023 [member] | Key contributor plan [member] | Key contributor plan 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 811 |
2023 [member] | Key contributor plan [member] | Key contributor plan 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 330 |
2023 [member] | Key contributor plan [member] | Key Contributor Plan2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 91 |
2023 [member] | Cash-settled plans [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 1,268 |
2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Total compensation expense | 444 |
2022 [member] | Executive performance plan [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 27 |
2022 [member] | Executive performance plan [member] | EPP 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 12 |
2022 [member] | Executive performance plan [member] | EPP 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 15 |
2022 [member] | Key contributor plan [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 369 |
2022 [member] | Key contributor plan [member] | Key contributor plan 2024 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 0 |
2022 [member] | Key contributor plan [member] | Key contributor plan 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 0 |
2022 [member] | Key contributor plan [member] | Key contributor plan 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 280 |
2022 [member] | Key contributor plan [member] | Key Contributor Plan2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 89 |
2022 [member] | Cash-settled plans [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 396 |
2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Total compensation expense | 396 |
2021 [member] | Executive performance plan [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 17 |
2021 [member] | Executive performance plan [member] | EPP 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 0 |
2021 [member] | Executive performance plan [member] | EPP 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 17 |
2021 [member] | Key contributor plan [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 355 |
2021 [member] | Key contributor plan [member] | Key contributor plan 2024 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 0 |
2021 [member] | Key contributor plan [member] | Key contributor plan 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 0 |
2021 [member] | Key contributor plan [member] | Key contributor plan 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 0 |
2021 [member] | Key contributor plan [member] | Key Contributor Plan2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 355 |
2021 [member] | Cash-settled plans [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Cash-settled plans | 372 |
Executive team plans [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 241 |
Executive team plans [member] | LTV 2024 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 44 |
Executive team plans [member] | LTV 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 49 |
Executive team plans [member] | LTV 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 50 |
Executive team plans [member] | LTV 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 98 |
Executive team plans [member] | Reporting year [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 93 |
Executive team plans [member] | Reporting year [member] | LTV 2024 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 44 |
Executive team plans [member] | Reporting year [member] | LTV 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 24 |
Executive team plans [member] | Reporting year [member] | LTV 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 18 |
Executive team plans [member] | Reporting year [member] | LTV 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 7 |
Executive team plans [member] | 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 76 |
Executive team plans [member] | 2023 [member] | LTV 2024 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 0 |
Executive team plans [member] | 2023 [member] | LTV 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 25 |
Executive team plans [member] | 2023 [member] | LTV 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 20 |
Executive team plans [member] | 2023 [member] | LTV 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 31 |
Executive team plans [member] | 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 48 |
Executive team plans [member] | 2022 [member] | LTV 2024 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 0 |
Executive team plans [member] | 2022 [member] | LTV 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 0 |
Executive team plans [member] | 2022 [member] | LTV 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 12 |
Executive team plans [member] | 2022 [member] | LTV 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 36 |
Executive team plans [member] | 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 24 |
Executive team plans [member] | 2021 [member] | LTV 2024 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 0 |
Executive team plans [member] | 2021 [member] | LTV 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 0 |
Executive team plans [member] | 2021 [member] | LTV 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 0 |
Executive team plans [member] | 2021 [member] | LTV 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 24 |
The President and CEO [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 85 |
The President and CEO [member] | Reporting year [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 24 |
The President and CEO [member] | 2023 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 28 |
The President and CEO [member] | 2022 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | 22 |
The President and CEO [member] | 2021 [member] |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Share-settled programs | kr 11 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 51 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_51_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 51 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_51_a&doctype=Standard -URIDate 2024-03-27 + Details
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